Reciprocating propeller.



PATENTBD APR. 14, 190s.

y W. DAWSON. R'VEGIPROGATING PRUPELLER.

APPLIGATION FILED sBPT.1g,1of1'.

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WILLIAM DAWSON, OF HAWARDEN, IOWA.

RECIPROCATING PROPELLER.

Specification of Letters Patent. Application led September 12, 1907.

Patented April 14, 1908.

Serial No. 392,545.

To all whom 'it may concern:

Be it known that I, WILLIAM DAWSON, a citizen of the United States, residing at Hawarden, in the county of Sioux and State of Iowa, have invented certain new and useful Improvements in Reciprocating Propellers, and I do declare thefollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in reci rocating propellers for vessels.

T e object of the invention is to provide' a propeller of this character which will be simple, strong and durable in construction, efficient in operation, and Well adapted to the pur ose for which it is designed.

ith the foregoing and other objects in view, the invention consists of certain novel features of construction, combination and arrangement of parts, as will be more fully described and particularly pointed out in the ap ended claims.

n the accompanying drawings: Figure 1 is a horizontal sectional view of a propeller constructed in accordance with the invention; Fig. 2 is a vertical cross-sectional view of the same; and Fig., 3 is a vertical longitudinal sectional view through one of the pro ellers casings, showing the arrangement of tIie propeller therein.

Referring more particularly to the drawings, 1, denotes the propeller casings of which there may be any desired number, said casing being arranged and supported in a suitable position on the vessel and projected longitudinally to the same. In the present instance, I have shown two of the casings arranged side by side, and supported in a frame work, 2, of the vessel. The casings, 1, are preferably rectangular in cross-section and of such length as to provide for the proper movement of the propellers arranged therein.

In each of the casings, 1, is slidably mounted a short inner casing, 3, said casing being also rectangular in cross-section and adapted to slidably engage the inner walls of the outer casing, 1. The casings, 3, are provided on their upper and lower sides with laterally projectlng guide studs, 4, which are adapted to engage central longitudinally disposed guide grooves or channels, 5, formed in the upper and lower sides of the outer casing, 1, as shown. The studs'working in the channels, 5, serve to hold the inner casings steady and to cause the same to move evenly when reci rocated in the outer casing, 1.

T e casings, 1 and 3, are open at each end and to the inner ends of the casing, 3, are connected the ends of operating rods, 6. The outer ends of which are rigidly connected to cross-heads, 7, which are slidably engaged with guide bars, 8, the inner ends of which are connected `to the casings, 1, while their outer ends are suitably connected to the frame work of the vessel. The crossheads, 7, are provided in their opposite ends with grooves or notches, by means of which they are supported in slidable engagement with the guide bars, 8. The ends of the operating rods, 6, project through the crossheads, 7, and are a apted to be connected by pitman rods, 9, to a crank shaft, 10, or any other suitable operating mechanism. The cranks on the shaft, 10, are arranged to project in opposite directions so that when one of the propellers is projected forwardly the other propeller will be moved rearwardly, as will be understood.

In each of the inner casings, 3, is arranged one or more series of pivotally mounted wings or blades, 12, said wings being arranged in pairs having their inner ends hingedly connected to centrally disposed vertical shafts, 13, secured at their upper and lower ends to upper and lower sides of the inner casings, as shown. The wings, 12, are hingedly mounted on the shafts, 13, in such position that when the casings, 3, are moved outwardly on the forward stroke of the operating rods, said wings will fold inwardly into engagement with triangularly shaped stops, 14, arranged on the walls of the top and bottom side of the casings, 3 ,said stops preventing the wings from folding entirely together, so that when the casings, 3, are drawn back on the inward stroke of the operating rods the rwater will enter between said folded wings, and force the same outwardly until the outer edges thereof are engaged with the opposite side walls of the casing, in which position they serve to propel the vessel forwardly when drawn back against the water, by means of the operating rods, 6.

Having thus described my invention, what I claim as new and desire to secure by Letters-Patent, is

1. A propeller of the character described, comprising a plurality of tubular outer oasings, tubular inner casings adapted to fit and slide in said outer casings, means in the upper and lower sides of said outer casings and on the adjacent sides of said inner casings whereby the latter are guided and steadied in their movements, means to alternately reciprocate said inner casings in the said outer casings, and wings or blades pivotally mounted at their inner ends in said inner casings and adapted to assume an inoperative position on the forward stroke of said inner casings and an operative position on the return stroke of the same, substantially as described.

2. A propeller of the character described comprising a plurality of tubular outer casings having formed in their upper and lower sides longitudinally disposed guide channels, tubular inner casings adapted to fit and slide in said outer casings, guide studs arranged on said inner casings to engage the guide channels in said outer casings whereby said inner casings are guided and steadied in their movement in said outer casings, means to reciprocate said inner casings, pivot shafts arranged therein, wings or blades pivotally mounted on said shafts and adapted to swing inwardly and outwardly to open and close said inner casings when the same are reciprocated and means to prevent said wings from folding entirely together when swung inwardly to open said casings, substantially as described. v

3. A propeller of the character described,

comprising a plurality of longitudinally disposed tubular outer casings, a tubular inner casing slidably mounted in each of said outer casings, operating rods connected to the inner ends of said inner casings, cross-heads adapted to slidably support the outer ends of said operating rods, means whereby said operating rods and inner casings are a1ternately reciprocated in opposite directions, a series of vertically disposed shafts arranged in each of said inner casings, a series of wings or blades arranged in pairs and pivotally connected at their forward ends to said shafts whereby when the inner casings are moved outwardly on the forward stroke, said wings or blades will swing inwardly to a partially folded position, and when moved inwardly on the return stroke will open out against the sides of the inner casing, triangularly shaped stop plates arranged in said casing to prevent said wings folding entirely together, and means arranged on said inner casings, whereby the same are held true and steady in their movement through the outer casing, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. i

RUTH MILES, B. W. BRUNT. 

